diff -r f4faa7f73cb8 -r a939872c284d src/cx/tree.h
--- a/src/cx/tree.h	Wed Feb 14 21:43:32 2024 +0100
+++ b/src/cx/tree.h	Wed Feb 14 22:12:35 2024 +0100
@@ -108,7 +108,7 @@
  * 1 if one of the children might contain the data,
  * -1 if neither the node, nor the children contains the data
  */
-int (*cx_tree_search_func)(void const *node, void const* data);
+typedef int (*cx_tree_search_func)(void const *node, void const* data);
 
 #ifdef __cplusplus
 } // extern "C"